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Thickness‐Dependent Impedance of Composite Battery Electrodes Containing Ionic Liquid‐Based Electrolytes
Author(s) -
Cronau Marvin,
Kroll Moritz,
Szabo Marvin,
Sälzer Fabian,
Roling Bernhard
Publication year - 2020
Publication title -
batteries and supercaps
Language(s) - English
Resource type - Journals
ISSN - 2566-6223
DOI - 10.1002/batt.202000023
Subject(s) - electrolyte , ionic liquid , electrode , polarization (electrochemistry) , materials science , battery (electricity) , electrical impedance , ionic bonding , ion , analytical chemistry (journal) , inorganic chemistry , chemistry , electrical engineering , chromatography , thermodynamics , power (physics) , catalysis , organic chemistry , physics , engineering
Lithium‐ion battery models often neglect the salt concentration polarization inside the electrolyte‐filled pores of the composite electrodes. However, this concentration polarization causes a significant impedance, in particular in the case of electrolytes with low Li + transference numbers. Here, we analyze in detail measured and calculated impedance spectra of composite electrodes containing a solvate ionic liquid‐based electrolyte and an ionic liquid‐based electrolyte, respectively, in comparison to a conventional carbonate‐based electrolyte. For calculating spectra, we use a recently published model by Huang and Zhang. We find that the impedance at 10 −4 Hz, which is relevant for battery cycling rates around 1 C to 2 C, increases in the order carbonate‐based electrolyte